You could be describing a bad engine or tranny mount easily.
I check for that by opening the hood and having someone start it, hold
the brake down and put it in drive then give it some gas. I then do the
same in reverse.
If there is a bad mount there, one of those tests will show it.
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
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